How Much Does It Cost to Subdivide Land in Perth?

If you are considering subdividing a property in Perth, one of the first questions is usually the same: how much is this actually going to cost?

There is no single fixed price for subdivision. Two properties with the same zoning and the same proposed lot yield can end up with very different costs once servicing, demolition, retaining, access, drainage and upgrades to an existing dwelling are taken into account.

For a straightforward one-into-two residential subdivision in Perth, a broad early allowance of around $40,000 to $60,000 is commonly used before house construction costs. More involved projects can move beyond $70,000 to $100,000, particularly where demolition, sewer extensions, retaining walls, difficult site levels or significant service upgrades are required.

What does a typical Perth subdivision cost?

The table below is intended as an early feasibility guide rather than a quote. Some items will not apply to every project, and several costs cannot be confirmed until the site has been assessed and the WAPC conditions are known.

Current WAPC subdivision application fees

As at 13 October 2026, the WAPC fee for a standard Form 1A subdivision application creating up to 100 lots is $3,837 plus $85 per lot. These rates took effect on 1 July 2026. A standard two-lot application therefore costs $4,007.

The Form 1C endorsement stage carries a separate fee of $719 plus $8 per lot for subdivisions into up to 100 lots. A two-lot endorsement therefore costs $735, bringing the combined application and endorsement fees to $4,742.

Common-property lots also count when calculating these fees. Amalgamation-only applications have separate fee provisions. These statutory charges are only one part of the overall subdivision budget. Fees are reviewed periodically, so the current amount should always be checked immediately before lodgement.

Water and sewer costs

Water Corporation requirements can include infrastructure contributions, future water services, meter relocations, sewer junctions and other servicing works.

For 2026-27, Water Corporation lists a future 20mm metropolitan water service connection at $1,876.92, a 20mm meter relocation of more than 0.5m at $2,072.17, and sewer junction cut-in fees of $1,062.93 for 100mm and $1,292.07 for 150mm.

Those published fees do not necessarily represent the complete plumbing or servicing cost for the subdivision. Private plumbing work, sewer extensions, re-routing of existing drainage or sewer, and site-specific infrastructure contributions can add significantly to the project.

Power can be straightforward - or surprisingly expensive

Residential subdivision will normally require underground power to the new lots. The cost depends heavily on where the existing network is located and what infrastructure is already available at the property.

A site with a suitable existing underground point of supply may be relatively simple. A property requiring a new pillar or dome, trenching, switchboard upgrades, conversion of an existing dwelling from overhead to underground supply or long private cable runs can cost considerably more.

This is one of the reasons a desktop feasibility should look at the street infrastructure, not just the R-Code and lot dimensions.

The biggest cost surprises are usually physical works

The statutory fees are reasonably predictable. The physical work on the site is where subdivision budgets tend to move.

• retaining walls required because of a sloping block;
• unexpected sewer depth or a sewer main in an inconvenient location;
• demolition of a house, garage, patio, pool or other structures;
• asbestos removal;
• construction of a long battleaxe driveway;
• drainage upgrades or soakwell requirements;
• removal and reinstatement of redundant crossovers;
• tree removal or landscaping requirements;
• modifications needed to make a retained dwelling compliant with new boundaries; and
• local government or infrastructure contribution requirements.

A subdivision that looks inexpensive at first glance can become a very different project once these items are identified.

Does retaining the existing house save money?

It can, but not always.

Retaining a suitable existing residence avoids demolition and preserves an existing asset. For many backyard subdivisions, that is exactly what makes the project attractive.

However, the retained home may need alterations to work with the new lot layout. Parking may need to move, an existing garage or patio may need to be removed, eaves may conflict with the new access leg, fences may need to be rebuilt, services may need to be separated and the home may need to demonstrate compliance against the new proposed boundaries.

The right feasibility therefore compares the cost of retaining the house with the development value it preserves.

Green title or survey-strata - does it affect cost?

Potentially. A freehold subdivision, commonly called green title, and a survey-strata subdivision create different forms of tenure and can lead to different servicing and access arrangements.

Survey-strata can allow common property, such as a shared driveway, while a green-title arrangement generally relies on separately titled land and any required easements or access arrangements.

The cheapest title structure is not automatically the best one. The subdivision configuration should be selected around the site, services, future dwelling design, marketability and the owner's objectives.

Don't forget holding, finance and tax costs

The subdivision works are only part of the financial picture.

Depending on how the project is funded and how long it takes, there may also be interest, rates, insurance, accounting, legal and settlement costs. Tax consequences can also differ depending on the owner's circumstances and what happens to the resulting land.

These are areas where project-specific advice from an accountant, finance professional or solicitor may be appropriate. They should still be included in the feasibility rather than treated as an afterthought.

How long should I allow?

A small residential subdivision is not usually a quick process. Industry guidance commonly places straightforward projects in the six-to-12-month range from initial work through to titles, although the actual timeframe depends on the WAPC decision, the conditions imposed, authority processing and how quickly the physical works can be completed.

Holding costs matter because every additional month can affect the final project return.

Why feasibility matters before you lodge

A subdivision application can tell you whether the WAPC is prepared to approve a proposal, but the better question should be asked earlier: is this subdivision worth doing?

Before committing to the project, we want to understand the likely lot yield, subdivision type, retained-house implications, access, services, site works, indicative costs and the likely value or use of the resulting lots.

That allows the property owner to compare different strategies - for example, retain and subdivide, demolish and create two or three lots, build before titles, sell vacant land, or retain the property as it is.

How Shoreline Design can help

Shoreline Design can assist at the front end with subdivision and development feasibility, residential design and subdivision strategy, and then coordinate the approvals, consultants and delivery process where a project proceeds.

Our aim is to identify the expensive problems early, while there is still an opportunity to change the plan.

This article is general information for Perth property owners. Planning rules, fees and costs change, and every property is different, so check the requirements for your own property before you act on it.